Glucose, α-amino nitrogen, serum insulin, and HGH were studied in preterm infants during the first 24 hours of life.

Glucose infusion (1.25 gm.) resulted in a slight elevation of serum insulin. When this amount of glucose was infused during the last 30 minutes of a two-and-a-half-hour infusion of a mixture of essential amino acids, there was a rapid and striking increase in serum insulin. However, this increase was not associated with a faster glucose disposal rate. The administration of this mixture of amino acids doubled the basal level of α-amino nitrogen, and during the first two hours, before glucose infusion, it caused a significant rise of serum insulin and HGH. In both cases glucose caused an increase of HGH secretion that was not significantly different in the two groups of infants.

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